Regularly check hash set addresses to verify memory integrity.

src/heap/store-buffer.cc

Index: src/heap/store-buffer.cc
diff --git a/src/heap/store-buffer.cc b/src/heap/store-buffer.cc
index aac68116ce840f3ca72715c41aaa3809ac028173..d126551242634f855fbebd723fad2f53aed5dc69 100644
--- a/src/heap/store-buffer.cc
+++ b/src/heap/store-buffer.cc
@@ -81,6 +81,9 @@ void StoreBuffer::SetUp() {
   hash_sets_are_empty_ = false;
 
   ClearFilteringHashSets();
+
+  heap_->isolate()->set_store_buffer_hash_set_1_address(hash_set_1_);
+  heap_->isolate()->set_store_buffer_hash_set_2_address(hash_set_2_);
 }
 
 
@@ -554,6 +557,9 @@ void StoreBuffer::IteratePointersToNewSpace(ObjectSlotCallback slot_callback,
 
 
 void StoreBuffer::Compact() {
+  CHECK(hash_set_1_ == heap_->isolate()->store_buffer_hash_set_1_address());
+  CHECK(hash_set_2_ == heap_->isolate()->store_buffer_hash_set_2_address());
+
   Address* top = reinterpret_cast<Address*>(heap_->store_buffer_top());
 
   if (top == start_) return;